Funnily enough, I have difficulty seeing the X-Wings and usually see
the XY-Wings more easily. That was the case today but afterwards I saw
that there is another 4 X-Wing (Columns 3 and 9) which opens the same
XY-Wing as in Clement's first post. (In addition it opens a useless 125 XY-
Wing to add to the equally useless 16 W-Wing in columns 7 and 8 ).